When choosing an infrared thermometer, three things might be taken into account.
Performance indicators, such as temperature range, spot size, working wavelength, measurement accuracy, response time, etc.; environmental and working conditions, such as ambient temperature, window, display and output, protection accessories, etc.; other options, such as ease of use, maintenance and calibration performance, and price, etc., also have a certain impact on the choice of thermometers. With the continuous development of technology and technology, the best design and new progress of infrared thermometers provide users with various functions and multi-purpose instruments, expanding the choice.
The signal processing function of the infrared thermometer is explained to determine the temperature measurement range: the temperature measurement range is the most important performance index of the thermometer. Each type of thermometer has its own specific temperature range. Therefore, the user's measured temperature range must be considered accurately and comprehensively, neither too narrow nor too wide. According to the law of black body radiation, the change of radiant energy caused by temperature in the short-wave band of the spectrum will exceed the change of radiant energy caused by emissivity error. Therefore, it is better to use short-wave as much as possible when measuring temperature.
Determine the target size: Infrared thermometers can be divided into single-color thermometers and two-color thermometers (radiation colorimetric thermometers) according to the principle. For a monochromatic thermometer, when measuring temperature, the area of the target to be measured should fill the field of view of the thermometer. It is recommended that the measured target size exceed 50% of the field of view. If the target size is smaller than the field of view, the background radiation energy will enter the visual and acoustic symbols of the thermometer and interfere with the temperature measurement readings, causing errors. Conversely, if the target is larger than the pyrometer's field of view, the pyrometer will not be affected by background outside the measurement area.
The signal processing function of the infrared thermometer is explained to determine the optical resolution (distance is sensitive) The optical resolution is determined by the ratio of D to S, which is the ratio of the distance D between the thermometer to the target and the diameter S of the measurement spot. If the thermometer must be installed far away from the target due to environmental conditions, and a small target must be measured, a thermometer with high optical resolution should be selected. The higher the optical resolution, i.e. increasing the D:S ratio, the higher the cost of the pyrometer.
